Yes, the SBT seems active at all times,,, so Pat at ART has designed a work-around, by snooping the data lines and timing out - allowing the Legato II to enter the battery-charging state (without having to unplug the USB cable).
My Legato is in the shop right now getting the modification (it's a tiny circuit that hardly draws any power, and should be completely unintrusive).
Haven't visited this thread for awhile. Nice to see you guys onto the Legato II. Yes, it is the best sounding redbook transport in my book.
I have been working with Pat on the work-around for the batt charging circuit with regard to SBT and folks that do not turn off their PCs. I still haven't got my updated PCB yet.